The hammerhead ribozyme is one of the best studied ribozymes, but it still presents challenges for our understanding of RNA catalysis. It catalyzes a transesterification reaction that converts a 5',3' diester to a 2',3' cyclic phosphate diester via an S(N)2 mechanism. Thus, the overall reaction corresponds to that catalyzed by bovine pancreatic ribonuclease… (More)
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